third_party/rust_crates/vendor/rustc-demangle/src/legacy.rs - fuchsia - Git at Google

 use core::char;
 use core::fmt;

 /// Representation of a demangled symbol name.
 pub struct Demangle<'a> {
     inner: &'a str,
     /// The number of ::-separated elements in the original name.
     elements: usize,
 }

 /// De-mangles a Rust symbol into a more readable version
 ///
 /// All Rust symbols by default are mangled as they contain characters that
 /// cannot be represented in all object files. The mangling mechanism is similar
 /// to C++'s, but Rust has a few specifics to handle items like lifetimes in
 /// symbols.
 ///
 /// This function will take a **mangled** symbol and return a value. When printed,
 /// the de-mangled version will be written. If the symbol does not look like
 /// a mangled symbol, the original value will be written instead.
 ///
 /// # Examples
 ///
 /// ```
 /// use rustc_demangle::demangle;
 ///
 /// assert_eq!(demangle("_ZN4testE").to_string(), "test");
 /// assert_eq!(demangle("_ZN3foo3barE").to_string(), "foo::bar");
 /// assert_eq!(demangle("foo").to_string(), "foo");
 /// ```

 // All Rust symbols are in theory lists of "::"-separated identifiers. Some
 // assemblers, however, can't handle these characters in symbol names. To get
 // around this, we use C++-style mangling. The mangling method is:
 //
 // 1. Prefix the symbol with "_ZN"
 // 2. For each element of the path, emit the length plus the element
 // 3. End the path with "E"
 //
 // For example, "_ZN4testE" => "test" and "_ZN3foo3barE" => "foo::bar".
 //
 // We're the ones printing our backtraces, so we can't rely on anything else to
 // demangle our symbols. It's *much* nicer to look at demangled symbols, so
 // this function is implemented to give us nice pretty output.
 //
 // Note that this demangler isn't quite as fancy as it could be. We have lots
 // of other information in our symbols like hashes, version, type information,
 // etc. Additionally, this doesn't handle glue symbols at all.
 pub fn demangle(s: &str) -> Result<(Demangle, &str), ()> {
     // First validate the symbol. If it doesn't look like anything we're
     // expecting, we just print it literally. Note that we must handle non-Rust
     // symbols because we could have any function in the backtrace.
     let inner = if s.starts_with("_ZN") {
         &s[3..]
     } else if s.starts_with("ZN") {
         // On Windows, dbghelp strips leading underscores, so we accept "ZN...E"
         // form too.
         &s[2..]
     } else if s.starts_with("__ZN") {
         // On OSX, symbols are prefixed with an extra _
         &s[4..]
     } else {
         return Err(());
     };

     // only work with ascii text
     if inner.bytes().any(|c| c & 0x80 != 0) {
         return Err(());
     }

     let mut elements = 0;
     let mut chars = inner.chars();
     let mut c = try!(chars.next().ok_or(()));
     while c != 'E' {
         // Decode an identifier element's length.
         if !c.is_digit(10) {
             return Err(());
         }
         let mut len = 0usize;
         while let Some(d) = c.to_digit(10) {
             len = try!(len.checked_mul(10)
                 .and_then(|len| len.checked_add(d as usize))
                 .ok_or(()));
             c = try!(chars.next().ok_or(()));
         }

         // `c` already contains the first character of this identifier, skip it and
         // all the other characters of this identifier, to reach the next element.
         for _ in 0..len {
             c = try!(chars.next().ok_or(()));
         }

         elements += 1;
     }

     Ok((Demangle {
         inner: inner,
         elements: elements,
     }, chars.as_str()))
 }

 // Rust hashes are hex digits with an `h` prepended.
 fn is_rust_hash(s: &str) -> bool {
     s.starts_with('h') && s[1..].chars().all(|c| c.is_digit(16))
 }

 impl<'a> fmt::Display for Demangle<'a> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         // Alright, let's do this.
         let mut inner = self.inner;
         for element in 0..self.elements {
             let mut rest = inner;
             while rest.chars().next().unwrap().is_digit(10) {
                 rest = &rest[1..];
             }
             let i: usize = inner[..(inner.len() - rest.len())].parse().unwrap();
             inner = &rest[i..];
             rest = &rest[..i];
             // Skip printing the hash if alternate formatting
             // was requested.
             if f.alternate() && element+1 == self.elements && is_rust_hash(&rest) {
                 break;
             }
             if element != 0 {
                 try!(f.write_str("::"));
             }
             if rest.starts_with("_$") {
                 rest = &rest[1..];
             }
             loop {
                 if rest.starts_with('.') {
                     if let Some('.') = rest[1..].chars().next() {
                         try!(f.write_str("::"));
                         rest = &rest[2..];
                     } else {
                         try!(f.write_str("."));
                         rest = &rest[1..];
                     }
                 } else if rest.starts_with('$') {
                     let (escape, after_escape) = if let Some(end) = rest[1..].find('$') {
                         (&rest[1..end + 1], &rest[end + 2..])
                     } else {
                         break;
                     };

                     // see src/librustc_codegen_utils/symbol_names/legacy.rs for these mappings
                     let unescaped = match escape {
                         "SP" => "@",
                         "BP" => "*",
                         "RF" => "&",
                         "LT" => "<",
                         "GT" => ">",
                         "LP" => "(",
                         "RP" => ")",
                         "C" => ",",

                         _ => {
                             if escape.starts_with('u') {
                                 let digits = &escape[1..];
                                 let all_lower_hex = digits.chars().all(|c| match c {
                                     '0'...'9' | 'a'...'f' => true,
                                     _ => false,
                                 });
                                 let c = u32::from_str_radix(digits, 16).ok()
                                     .and_then(char::from_u32);
                                 if let (true, Some(c)) = (all_lower_hex, c) {
                                     // FIXME(eddyb) do we need to filter out control codepoints?
                                     if !c.is_control() {
                                         try!(c.fmt(f));
                                         rest = after_escape;
                                         continue;
                                     }
                                 }
                             }
                             break;
                         }
                     };
                     try!(f.write_str(unescaped));
                     rest = after_escape;
                 } else if let Some(i) = rest.find(|c| c == '$' || c == '.') {
                     try!(f.write_str(&rest[..i]));
                     rest = &rest[i..];
                 } else {
                     break;
                 }
             }
             try!(f.write_str(rest));
         }

         Ok(())
     }
 }

 #[cfg(test)]
 mod tests {
     use std::prelude::v1::*;

     macro_rules! t {
         ($a:expr, $b:expr) => (assert!(ok($a, $b)))
     }

     macro_rules! t_err {
         ($a:expr) => (assert!(ok_err($a)))
     }

     macro_rules! t_nohash {
         ($a:expr, $b:expr) => ({
             assert_eq!(format!("{:#}", ::demangle($a)), $b);
         })
     }

     fn ok(sym: &str, expected: &str) -> bool {
         match ::try_demangle(sym) {
             Ok(s) => {
                 if s.to_string() == expected  {
                     true
                 } else {
                     println!("\n{}\n!=\n{}\n", s, expected);
                     false
                 }
             }
             Err(_) => {
                 println!("error demangling");
                 false
             }
         }
     }

     fn ok_err(sym: &str) -> bool {
         match ::try_demangle(sym) {
             Ok(_) => {
                 println!("succeeded in demangling");
                 false
             }
             Err(_) => ::demangle(sym).to_string() == sym,
         }
     }

     #[test]
     fn demangle() {
         t_err!("test");
         t!("_ZN4testE", "test");
         t_err!("_ZN4test");
         t!("_ZN4test1a2bcE", "test::a::bc");
     }

     #[test]
     fn demangle_dollars() {
         t!("_ZN4$RP$E", ")");
         t!("_ZN8$RF$testE", "&test");
         t!("_ZN8$BP$test4foobE", "*test::foob");
         t!("_ZN9$u20$test4foobE", " test::foob");
         t!("_ZN35Bar$LT$$u5b$u32$u3b$$u20$4$u5d$$GT$E", "Bar<[u32; 4]>");
     }

     #[test]
     fn demangle_many_dollars() {
         t!("_ZN13test$u20$test4foobE", "test test::foob");
         t!("_ZN12test$BP$test4foobE", "test*test::foob");
     }


     #[test]
     fn demangle_osx() {
         t!("__ZN5alloc9allocator6Layout9for_value17h02a996811f781011E", "alloc::allocator::Layout::for_value::h02a996811f781011");
         t!("__ZN38_$LT$core..option..Option$LT$T$GT$$GT$6unwrap18_MSG_FILE_LINE_COL17haf7cb8d5824ee659E", "<core::option::Option<T>>::unwrap::_MSG_FILE_LINE_COL::haf7cb8d5824ee659");
         t!("__ZN4core5slice89_$LT$impl$u20$core..iter..traits..IntoIterator$u20$for$u20$$RF$$u27$a$u20$$u5b$T$u5d$$GT$9into_iter17h450e234d27262170E", "core::slice::<impl core::iter::traits::IntoIterator for &'a [T]>::into_iter::h450e234d27262170");
     }

     #[test]
     fn demangle_windows() {
         t!("ZN4testE", "test");
         t!("ZN13test$u20$test4foobE", "test test::foob");
         t!("ZN12test$RF$test4foobE", "test&test::foob");
     }

     #[test]
     fn demangle_elements_beginning_with_underscore() {
         t!("_ZN13_$LT$test$GT$E", "<test>");
         t!("_ZN28_$u7b$$u7b$closure$u7d$$u7d$E", "{{closure}}");
         t!("_ZN15__STATIC_FMTSTRE", "__STATIC_FMTSTR");
     }

     #[test]
     fn demangle_trait_impls() {
         t!("_ZN71_$LT$Test$u20$$u2b$$u20$$u27$static$u20$as$u20$foo..Bar$LT$Test$GT$$GT$3barE",
            "<Test + 'static as foo::Bar<Test>>::bar");
     }

     #[test]
     fn demangle_without_hash() {
         let s = "_ZN3foo17h05af221e174051e9E";
         t!(s, "foo::h05af221e174051e9");
         t_nohash!(s, "foo");
     }

     #[test]
     fn demangle_without_hash_edgecases() {
         // One element, no hash.
         t_nohash!("_ZN3fooE", "foo");
         // Two elements, no hash.
         t_nohash!("_ZN3foo3barE", "foo::bar");
         // Longer-than-normal hash.
         t_nohash!("_ZN3foo20h05af221e174051e9abcE", "foo");
         // Shorter-than-normal hash.
         t_nohash!("_ZN3foo5h05afE", "foo");
         // Valid hash, but not at the end.
         t_nohash!("_ZN17h05af221e174051e93fooE", "h05af221e174051e9::foo");
         // Not a valid hash, missing the 'h'.
         t_nohash!("_ZN3foo16ffaf221e174051e9E", "foo::ffaf221e174051e9");
         // Not a valid hash, has a non-hex-digit.
         t_nohash!("_ZN3foo17hg5af221e174051e9E", "foo::hg5af221e174051e9");
     }

     #[test]
     fn demangle_thinlto() {
         // One element, no hash.
         t!("_ZN3fooE.llvm.9D1C9369", "foo");
         t!("_ZN3fooE.llvm.9D1C9369@@16", "foo");
         t_nohash!("_ZN9backtrace3foo17hbb467fcdaea5d79bE.llvm.A5310EB9", "backtrace::foo");
     }

     #[test]
     fn demangle_llvm_ir_branch_labels() {
         t!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut::haf9727c2edfbc47b.exit.i.i");
         t_nohash!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut.exit.i.i");
     }

     #[test]
     fn demangle_ignores_suffix_that_doesnt_look_like_a_symbol() {
         t_err!("_ZN3fooE.llvm moocow");
     }

     #[test]
     fn dont_panic() {
         ::demangle("_ZN2222222222222222222222EE").to_string();
         ::demangle("_ZN5*70527e27.ll34csaғE").to_string();
         ::demangle("_ZN5*70527a54.ll34_$b.1E").to_string();
         ::demangle("\
             _ZN5~saäb4e\n\
             2734cOsbE\n\
             5usage20h)3\0\0\0\0\0\0\07e2734cOsbE\
         ").to_string();
     }

     #[test]
     fn invalid_no_chop() {
         t_err!("_ZNfooE");
     }

     #[test]
     fn handle_assoc_types() {
         t!("_ZN151_$LT$alloc..boxed..Box$LT$alloc..boxed..FnBox$LT$A$C$$u20$Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$9call_once17h69e8f44b3723e1caE", "<alloc::boxed::Box<alloc::boxed::FnBox<A, Output=R> + 'a> as core::ops::function::FnOnce<A>>::call_once::h69e8f44b3723e1ca");
     }

     #[test]
     fn handle_bang() {
         t!(
             "_ZN88_$LT$core..result..Result$LT$$u21$$C$$u20$E$GT$$u20$as$u20$std..process..Termination$GT$6report17hfc41d0da4a40b3e8E",
             "<core::result::Result<!, E> as std::process::Termination>::report::hfc41d0da4a40b3e8"
         );
     }

     #[test]
     fn demangle_utf8_idents() {
         t_nohash!(
             "_ZN11utf8_idents157_$u10e1$$u10d0$$u10ed$$u10db$$u10d4$$u10da$$u10d0$$u10d3$_$u10d2$$u10d4$$u10db$$u10e0$$u10d8$$u10d4$$u10da$$u10d8$_$u10e1$$u10d0$$u10d3$$u10d8$$u10da$$u10d8$17h21634fd5714000aaE",
             "utf8_idents::საჭმელად_გემრიელი_სადილი"
         );
     }

     #[test]
     fn demangle_issue_60925() {
         t_nohash!(
             "_ZN11issue_609253foo37Foo$LT$issue_60925..llv$u6d$..Foo$GT$3foo17h059a991a004536adE",
             "issue_60925::foo::Foo<issue_60925::llvm::Foo>::foo"
         );
     }
 }
	use core::char;
	use core::fmt;

	/// Representation of a demangled symbol name.
	pub struct Demangle<'a> {
	inner: &'a str,
	/// The number of ::-separated elements in the original name.
	elements: usize,
	}

	/// De-mangles a Rust symbol into a more readable version
	///
	/// All Rust symbols by default are mangled as they contain characters that
	/// cannot be represented in all object files. The mangling mechanism is similar
	/// to C++'s, but Rust has a few specifics to handle items like lifetimes in
	/// symbols.
	///
	/// This function will take a mangled symbol and return a value. When printed,
	/// the de-mangled version will be written. If the symbol does not look like
	/// a mangled symbol, the original value will be written instead.
	///
	/// # Examples
	///
	/// ```
	/// use rustc_demangle::demangle;
	///
	/// assert_eq!(demangle("_ZN4testE").to_string(), "test");
	/// assert_eq!(demangle("_ZN3foo3barE").to_string(), "foo::bar");
	/// assert_eq!(demangle("foo").to_string(), "foo");
	/// ```

	// All Rust symbols are in theory lists of "::"-separated identifiers. Some
	// assemblers, however, can't handle these characters in symbol names. To get
	// around this, we use C++-style mangling. The mangling method is:
	//
	// 1. Prefix the symbol with "_ZN"
	// 2. For each element of the path, emit the length plus the element
	// 3. End the path with "E"
	//
	// For example, "_ZN4testE" => "test" and "_ZN3foo3barE" => "foo::bar".
	//
	// We're the ones printing our backtraces, so we can't rely on anything else to
	// demangle our symbols. It's much nicer to look at demangled symbols, so
	// this function is implemented to give us nice pretty output.
	//
	// Note that this demangler isn't quite as fancy as it could be. We have lots
	// of other information in our symbols like hashes, version, type information,
	// etc. Additionally, this doesn't handle glue symbols at all.
	pub fn demangle(s: &str) -> Result<(Demangle, &str), ()> {
	// First validate the symbol. If it doesn't look like anything we're
	// expecting, we just print it literally. Note that we must handle non-Rust
	// symbols because we could have any function in the backtrace.
	let inner = if s.starts_with("_ZN") {
	&s[3..]
	} else if s.starts_with("ZN") {
	// On Windows, dbghelp strips leading underscores, so we accept "ZN...E"
	// form too.
	&s[2..]
	} else if s.starts_with("__ZN") {
	// On OSX, symbols are prefixed with an extra _
	&s[4..]
	} else {
	return Err(());
	};

	// only work with ascii text
	if inner.bytes().any(\|c\| c & 0x80 != 0) {
	return Err(());
	}

	let mut elements = 0;
	let mut chars = inner.chars();
	let mut c = try!(chars.next().ok_or(()));
	while c != 'E' {
	// Decode an identifier element's length.
	if !c.is_digit(10) {
	return Err(());
	}
	let mut len = 0usize;
	while let Some(d) = c.to_digit(10) {
	len = try!(len.checked_mul(10)
	.and_then(\|len\| len.checked_add(d as usize))
	.ok_or(()));
	c = try!(chars.next().ok_or(()));
	}

	// `c` already contains the first character of this identifier, skip it and
	// all the other characters of this identifier, to reach the next element.
	for _ in 0..len {
	c = try!(chars.next().ok_or(()));
	}

	elements += 1;
	}

	Ok((Demangle {
	inner: inner,
	elements: elements,
	}, chars.as_str()))
	}

	// Rust hashes are hex digits with an `h` prepended.
	fn is_rust_hash(s: &str) -> bool {
	s.starts_with('h') && s[1..].chars().all(\|c\| c.is_digit(16))
	}

	impl<'a> fmt::Display for Demangle<'a> {
	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
	// Alright, let's do this.
	let mut inner = self.inner;
	for element in 0..self.elements {
	let mut rest = inner;
	while rest.chars().next().unwrap().is_digit(10) {
	rest = &rest[1..];
	}
	let i: usize = inner[..(inner.len() - rest.len())].parse().unwrap();
	inner = &rest[i..];
	rest = &rest[..i];
	// Skip printing the hash if alternate formatting
	// was requested.
	if f.alternate() && element+1 == self.elements && is_rust_hash(&rest) {
	break;
	}
	if element != 0 {
	try!(f.write_str("::"));
	}
	if rest.starts_with("_$") {
	rest = &rest[1..];
	}
	loop {
	if rest.starts_with('.') {
	if let Some('.') = rest[1..].chars().next() {
	try!(f.write_str("::"));
	rest = &rest[2..];
	} else {
	try!(f.write_str("."));
	rest = &rest[1..];
	}
	} else if rest.starts_with('$') {
	let (escape, after_escape) = if let Some(end) = rest[1..].find('$') {
	(&rest[1..end + 1], &rest[end + 2..])
	} else {
	break;
	};

	// see src/librustc_codegen_utils/symbol_names/legacy.rs for these mappings
	let unescaped = match escape {
	"SP" => "@",
	"BP" => "*",
	"RF" => "&",
	"LT" => "<",
	"GT" => ">",
	"LP" => "(",
	"RP" => ")",
	"C" => ",",

	_ => {
	if escape.starts_with('u') {
	let digits = &escape[1..];
	let all_lower_hex = digits.chars().all(\|c\| match c {
	'0'...'9' \| 'a'...'f' => true,
	_ => false,
	});
	let c = u32::from_str_radix(digits, 16).ok()
	.and_then(char::from_u32);
	if let (true, Some(c)) = (all_lower_hex, c) {
	// FIXME(eddyb) do we need to filter out control codepoints?
	if !c.is_control() {
	try!(c.fmt(f));
	rest = after_escape;
	continue;
	}
	}
	}
	break;
	}
	};
	try!(f.write_str(unescaped));
	rest = after_escape;
	} else if let Some(i) = rest.find(\|c\| c == '$' \|\| c == '.') {
	try!(f.write_str(&rest[..i]));
	rest = &rest[i..];
	} else {
	break;
	}
	}
	try!(f.write_str(rest));
	}

	Ok(())
	}
	}

	#[cfg(test)]
	mod tests {
	use std::prelude::v1::*;

	macro_rules! t {
	($a:expr, $b:expr) => (assert!(ok($a, $b)))
	}

	macro_rules! t_err {
	($a:expr) => (assert!(ok_err($a)))
	}

	macro_rules! t_nohash {
	($a:expr, $b:expr) => ({
	assert_eq!(format!("{:#}", ::demangle($a)), $b);
	})
	}

	fn ok(sym: &str, expected: &str) -> bool {
	match ::try_demangle(sym) {
	Ok(s) => {
	if s.to_string() == expected {
	true
	} else {
	println!("\n{}\n!=\n{}\n", s, expected);
	false
	}
	}
	Err(_) => {
	println!("error demangling");
	false
	}
	}
	}

	fn ok_err(sym: &str) -> bool {
	match ::try_demangle(sym) {
	Ok(_) => {
	println!("succeeded in demangling");
	false
	}
	Err(_) => ::demangle(sym).to_string() == sym,
	}
	}

	#[test]
	fn demangle() {
	t_err!("test");
	t!("_ZN4testE", "test");
	t_err!("_ZN4test");
	t!("_ZN4test1a2bcE", "test::a::bc");
	}

	#[test]
	fn demangle_dollars() {
	t!("_ZN4$RP$E", ")");
	t!("_ZN8$RF$testE", "&test");
	t!("_ZN8$BP$test4foobE", "*test::foob");
	t!("_ZN9$u20$test4foobE", " test::foob");
	t!("_ZN35Bar$LT$$u5b$u32$u3b$$u20$4$u5d$$GT$E", "Bar<[u32; 4]>");
	}

	#[test]
	fn demangle_many_dollars() {
	t!("_ZN13test$u20$test4foobE", "test test::foob");
	t!("_ZN12test$BP$test4foobE", "test*test::foob");
	}


	#[test]
	fn demangle_osx() {
	t!("__ZN5alloc9allocator6Layout9for_value17h02a996811f781011E", "alloc::allocator::Layout::for_value::h02a996811f781011");
	t!("__ZN38_$LT$core..option..Option$LT$T$GT$$GT$6unwrap18_MSG_FILE_LINE_COL17haf7cb8d5824ee659E", "<core::option::Option<T>>::unwrap::_MSG_FILE_LINE_COL::haf7cb8d5824ee659");
	t!("__ZN4core5slice89_$LT$impl$u20$core..iter..traits..IntoIterator$u20$for$u20$$RF$$u27$a$u20$$u5b$T$u5d$$GT$9into_iter17h450e234d27262170E", "core::slice::<impl core::iter::traits::IntoIterator for &'a [T]>::into_iter::h450e234d27262170");
	}

	#[test]
	fn demangle_windows() {
	t!("ZN4testE", "test");
	t!("ZN13test$u20$test4foobE", "test test::foob");
	t!("ZN12test$RF$test4foobE", "test&test::foob");
	}

	#[test]
	fn demangle_elements_beginning_with_underscore() {
	t!("_ZN13_$LT$test$GT$E", "<test>");
	t!("_ZN28_$u7b$$u7b$closure$u7d$$u7d$E", "{{closure}}");
	t!("_ZN15__STATIC_FMTSTRE", "__STATIC_FMTSTR");
	}

	#[test]
	fn demangle_trait_impls() {
	t!("_ZN71_$LT$Test$u20$$u2b$$u20$$u27$static$u20$as$u20$foo..Bar$LT$Test$GT$$GT$3barE",
	"<Test + 'static as foo::Bar<Test>>::bar");
	}

	#[test]
	fn demangle_without_hash() {
	let s = "_ZN3foo17h05af221e174051e9E";
	t!(s, "foo::h05af221e174051e9");
	t_nohash!(s, "foo");
	}

	#[test]
	fn demangle_without_hash_edgecases() {
	// One element, no hash.
	t_nohash!("_ZN3fooE", "foo");
	// Two elements, no hash.
	t_nohash!("_ZN3foo3barE", "foo::bar");
	// Longer-than-normal hash.
	t_nohash!("_ZN3foo20h05af221e174051e9abcE", "foo");
	// Shorter-than-normal hash.
	t_nohash!("_ZN3foo5h05afE", "foo");
	// Valid hash, but not at the end.
	t_nohash!("_ZN17h05af221e174051e93fooE", "h05af221e174051e9::foo");
	// Not a valid hash, missing the 'h'.
	t_nohash!("_ZN3foo16ffaf221e174051e9E", "foo::ffaf221e174051e9");
	// Not a valid hash, has a non-hex-digit.
	t_nohash!("_ZN3foo17hg5af221e174051e9E", "foo::hg5af221e174051e9");
	}

	#[test]
	fn demangle_thinlto() {
	// One element, no hash.
	t!("_ZN3fooE.llvm.9D1C9369", "foo");
	t!("_ZN3fooE.llvm.9D1C9369@@16", "foo");
	t_nohash!("_ZN9backtrace3foo17hbb467fcdaea5d79bE.llvm.A5310EB9", "backtrace::foo");
	}

	#[test]
	fn demangle_llvm_ir_branch_labels() {
	t!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut::haf9727c2edfbc47b.exit.i.i");
	t_nohash!("_ZN4core5slice77_$LT$impl$u20$core..ops..index..IndexMut$LT$I$GT$$u20$for$u20$$u5b$T$u5d$$GT$9index_mut17haf9727c2edfbc47bE.exit.i.i", "core::slice::<impl core::ops::index::IndexMut<I> for [T]>::index_mut.exit.i.i");
	}

	#[test]
	fn demangle_ignores_suffix_that_doesnt_look_like_a_symbol() {
	t_err!("_ZN3fooE.llvm moocow");
	}

	#[test]
	fn dont_panic() {
	::demangle("_ZN2222222222222222222222EE").to_string();
	::demangle("_ZN5*70527e27.ll34csaғE").to_string();
	::demangle("_ZN5*70527a54.ll34_$b.1E").to_string();
	::demangle("\
	_ZN5~saäb4e\n\
	2734cOsbE\n\
	5usage20h)3\0\0\0\0\0\0\07e2734cOsbE\
	").to_string();
	}

	#[test]
	fn invalid_no_chop() {
	t_err!("_ZNfooE");
	}

	#[test]
	fn handle_assoc_types() {
	t!("_ZN151_$LT$alloc..boxed..Box$LT$alloc..boxed..FnBox$LT$A$C$$u20$Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$9call_once17h69e8f44b3723e1caE", "<alloc::boxed::Box<alloc::boxed::FnBox<A, Output=R> + 'a> as core::ops::function::FnOnce<A>>::call_once::h69e8f44b3723e1ca");
	}

	#[test]
	fn handle_bang() {
	t!(
	"_ZN88_$LT$core..result..Result$LT$$u21$$C$$u20$E$GT$$u20$as$u20$std..process..Termination$GT$6report17hfc41d0da4a40b3e8E",
	"<core::result::Result<!, E> as std::process::Termination>::report::hfc41d0da4a40b3e8"
	);
	}

	#[test]
	fn demangle_utf8_idents() {
	t_nohash!(
	"_ZN11utf8_idents157_$u10e1$$u10d0$$u10ed$$u10db$$u10d4$$u10da$$u10d0$$u10d3$_$u10d2$$u10d4$$u10db$$u10e0$$u10d8$$u10d4$$u10da$$u10d8$_$u10e1$$u10d0$$u10d3$$u10d8$$u10da$$u10d8$17h21634fd5714000aaE",
	"utf8_idents::საჭმელად_გემრიელი_სადილი"
	);
	}

	#[test]
	fn demangle_issue_60925() {
	t_nohash!(
	"_ZN11issue_609253foo37Foo$LT$issue_60925..llv$u6d$..Foo$GT$3foo17h059a991a004536adE",
	"issue_60925::foo::Foo<issue_60925::llvm::Foo>::foo"
	);
	}
	}